/* ¿Cuánto me sobra? — identidad: plano técnico. Azul cianotipia, líneas blancas y cotas.
   Tipografía: Tektur (rótulos técnicos) + IBM Plex Mono (cifras). */
:root { --font-body: "Instrument Sans", system-ui, sans-serif; --font-figure: "IBM Plex Mono", ui-monospace, monospace; --font-tech: "Tektur", "IBM Plex Mono", monospace;
  --paper: #eaf1f8; --surface: #f7fbff; --card: #f7fbff; --ink: #0c2a4a; --ink-soft: #46647f; --line: #b9cde0; --radius: 2px; }
@media (prefers-color-scheme: dark) { :root { --paper: #0a2540; --surface: #0f3358; --card: #0f3358; --ink: #e6f2ff; --ink-soft: #9fc0e0; --line: #2c5784; } }
.site-head h1, h2 { font-family: var(--font-tech); font-weight: 700; letter-spacing: 0.02em; text-transform: uppercase; }
.site-head h1 { font-size: clamp(1.5rem, 6vw, 2.1rem); }
.site-head h1::before { content: "PLANO Nº 01 · "; font: 500 0.7rem var(--font-figure); letter-spacing: 0.14em; display: block; color: var(--ink-soft); }
.panel, .result { border: 1px solid var(--ink); border-radius: 2px; background: var(--surface); position: relative; }
.panel::before, .result::before { content: ""; position: absolute; left: -1px; top: -1px; width: 14px; height: 14px; border-top: 3px solid var(--accent); border-left: 3px solid var(--accent); }
.result { padding: 1rem 1.1rem 1.25rem; }
.result .big { font-family: var(--font-figure); font-weight: 600; letter-spacing: -0.03em; }
.result dt { font-family: var(--font-tech); font-size: 0.8rem; letter-spacing: 0.04em; }

/* ¿Cuánto me sobra?: papel milimetrado (plano de obra) y azul de plano. */
:root { --accent: #0b5fa5; --plus: #0b5fa5; --grid: rgba(11, 95, 165, 0.08); }
@media (prefers-color-scheme: dark) { :root { --accent: #7cb8f0; --grid: rgba(124, 184, 240, 0.07); } }
body {
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
}
.big small { font-size: 0.45em; font-weight: 500; color: var(--ink-soft); margin-left: 0.3rem; }

.items { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; margin: 0.5rem 0 1rem; font-family: var(--font-figure); font-size: 0.9rem; }
.items th, .items td { text-align: left; padding: 0.4rem 0.5rem; border-bottom: 1px solid var(--line); } .items td:last-child, .items th:last-child { text-align: right; }
.items .total td { font-weight: 700; border-top: 2px solid var(--ink); }
.more { margin: 1rem 0 0; } .more summary { cursor: pointer; font-weight: 600; min-height: 44px; display: flex; align-items: center; }
.button { display: inline-flex; align-items: center; min-height: 44px; padding: 0 1rem; border: 1px solid var(--ink); border-radius: var(--radius); color: inherit; text-decoration: none; font-weight: 600; background: var(--surface); }